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Nucleophilic Aromatic Substitution: Elimination–Addition01:11

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Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
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Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Benzylic halogenation takes place under conditions that favor radical reactions such as heat, light, or a free radical initiator like peroxide.
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Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
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Updated: Mar 25, 2026

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Recent developments in synthetic methods for benzo[b]heteroles.

Bin Wu1, Naohiko Yoshikai

  • 1Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore. nyoshikai@ntu.edu.sg.

Organic & Biomolecular Chemistry
|February 20, 2016
PubMed
Summary

This review covers new synthetic methods for benzo[b]heteroles, compounds with potential in materials science. It highlights efficient and selective approaches for creating these important molecules.

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Area of Science:

  • Organic Chemistry
  • Materials Science

Background:

  • Benzo[b]heteroles with heteroatoms beyond nitrogen and oxygen are gaining interest for materials science applications.
  • There is a growing need for efficient, selective, and versatile synthetic routes to these compounds.

Purpose of the Study:

  • To review recent advancements in synthetic methodologies for benzo[b]heteroles.
  • To provide a comprehensive overview of approaches for accessing key members of the benzoheterole family.

Main Methods:

  • Literature review of synthetic strategies.
  • Analysis of methods focusing on efficiency, selectivity, and scope.

Main Results:

  • Summary of diverse synthetic routes developed recently.
  • Identification of key advancements in accessing benzoheterole structures.

Conclusions:

  • Recent developments offer improved access to benzo[b]heteroles.
  • These advancements facilitate their application in materials science.